better mpg and weird rattling

[ocbaud]

earlier tonight for a stop, when i hit the gas about half way, there was this loud rattling coming from behind me on the drivers side. i was thinking it was the exhaust supports coming loose, buts its not that. could it possibly be a bearing in the rear end?

oh and i'm now making 9.85 mpg about 1 mpg over what i made before my new plugs. i'm hopeing that since i wont be messing with the timing anymore,and if i keep my foot out of the gas, i should break 10 mpg!!!